DV/ZU

Pressure and Vacuum Relief Valve, In-Line

Function and Description

The PROTEGO® in-line valve DV/ZU is a state-of-the-art pressure and vacuum relief valve with separate flange connections for pressure and vacuum breathing. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels, and process equipment to protect against unallowable overpressure and underpressure. The valve prevents emission losses almost up to the set pressure and prevents unacceptable product entry. It is designed in a way that if the set pressure is exceeded, the vapors are released into anexhaust pipe (e.g., vent header). If the set vacuum is exceeded, atmospheric air is pulled into the system. For structural reasons, the vacuum valve pallet is one size smaller than the pressure valve pallet.

The device will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift. Continuous investments in and a commitment to research and development have allowed PROTEGO® to develop a low pressure valve which has the same opening characteristic as a high pressure safety relief valve. This “full lift type” technology allows the valve to be set at just 10% below the maximum allowable working pressure or vacuum (MAWP or MAWV) of the tank and still safely vent the required mass flow. The opening characteristic of the pressure and vacuum side is basically the same. However, the in-breathing will start as soon as the differential pressure between the connected in-breathing line and the tank is greater than the set pressure of the vacuum pallet. Due to our highly developed manufacturing technology, the tank pressure is maintained up to set pressure with a tightness that is far above the conventional standard. This feature is ensured by valve seats made of high quality stainless steel and with individually lapped valve pallets (1), or with an air cushion seal (2), in conjunction with high quality FEP diaphragm. The valve pallets are also available with a PTFE seal to prevent the valve pallets from sticking when sticky products are used and to enable the use of corrosive fluids. After the overpressure is released or the vacuum is balanced, the valve re-seats and provides a tight seal.

The optimized fluid dynamic design of the vent body and vent pallet is a result of many years of research, resulting in stable operation of the valve pallet, optimized performance, and reduced product losses.

Features and Advantages

based on 10% technology, set pressure is close to opening pressure for optimum pressure maintenance in the system as compared to conventional 40% or 100% technology

high flow capacity reduces costs through the use of smaller valves

separate connections for in-breathing and out-breathing pipes

can be used in explosion hazardous areas

sturdy housing design (PN 10)

maintenance-friendly design

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Dimensions

Dimensions

To select the nominal size (DN), please use the flow capacity charts on the following pages

DN

40 / 1½“

50 / 2"

80 / 3"

100 / 4"

150 / 6"

a

280 / 11.02

280 / 11.02

340 / 13.39

390 / 15.35

520 / 20.47

b

230 / 9.06

230 / 9.06

240 / 9.45

290 / 11.42

330 / 12.99

c

210 / 8.27

210 / 8.27

280 / 11.02

310 / 12.20

390 / 15.35

d

165 / 6.50

165 / 6.50

200 / 7.87

240 / 9.45

300 / 11.81

DN

40 / 1½“

50 / 2"

80 / 3"

100 / 4"

150 / 6"

a

280 / 11.02

280 / 11.02

340 / 13.39

390 / 15.35

520 / 20.47

b

230 / 9.06

230 / 9.06

240 / 9.45

290 / 11.42

330 / 12.99

c

210 / 8.27

210 / 8.27

280 / 11.02

310 / 12.20

390 / 15.35

d

165 / 6.50

165 / 6.50

200 / 7.87

240 / 9.45

300 / 11.81

Display complete tableCompress table view

Dimensions in mm / inchesLarger sizes upon requestDimensions for pressure and vacuum relief valve with heating jacket upon request

Detail X Detail X Tank connection Inbreathing Outbreathing

Material

Material selection for housing

Design

A

B

Housing

Steel

Stainless Steel

Heating jacket (DV / ZU-H-...)

Steel

Stainless Steel

Valve seat

Stainless Steel

Stainless Steel

Gasket

PTFE

PTFE

Design

A

B

Housing

Steel

Stainless Steel

Heating jacket (DV / ZU-H-...)

Steel

Stainless Steel

Valve seat

Stainless Steel

Stainless Steel

Gasket

PTFE

PTFE

Display complete tableCompress table view

Option: Housing with ECTFE-liningSpecial materials upon request

Material selection for pressure valve pallet

Design

A

B

C

D

Pressure range [mbar] [inch W.C.]

+2.0up to +3.5 +0.8up to +1.4

>+3.5up to +14 >+1.4 up to +5.6

>+14up to +60>+5.6up to +24

>+14up to +60>+5.6up to +24

Valve pallet

Aluminium

Stainless Steel

Stainless Steel

Stainless Steel

Sealing

FEP

FEP

Metal to Metal

PTFE

Design

A

B

C

D

Pressure range [mbar] [inch W.C.]

+2.0up to +3.5 +0.8up to +1.4

>+3.5up to +14 >+1.4 up to +5.6

>+14up to +60>+5.6up to +24

>+14up to +60>+5.6up to +24

Valve pallet

Aluminium

Stainless Steel

Stainless Steel

Stainless Steel

Sealing

FEP

FEP

Metal to Metal

PTFE

Display complete tableCompress table view

Special materials upon requestFor higher set pressures refer to type DV/ZU-F.

Material selection for vacuum valve pallet

Design

A

B

C

D

E

F

Pressure range [mbar][inch W.C.]

-3.5up to -5.0-1.4up to -2.0

<-5.0 up to -14<-2.0up to -5.6

<-14up to -35<-5.6 up to -14

<-35 up to -50<-14 up to -20

<-14 up to -35<-5.6 up to -14

<-35 up to -50<-14 up to -20

Valve pallet

Aluminium

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Sealing

FEP

FEP

Metal to Metal

Metal to Metal

PTFE

PTFE

Design

A

B

C

D

E

F

Pressure range [mbar][inch W.C.]

-3.5up to -5.0-1.4up to -2.0

<-5.0 up to -14<-2.0up to -5.6

<-14up to -35<-5.6 up to -14

<-35 up to -50<-14 up to -20

<-14 up to -35<-5.6 up to -14

<-35 up to -50<-14 up to -20

Valve pallet

Aluminium

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Sealing

FEP

FEP

Metal to Metal

Metal to Metal

PTFE

PTFE

Display complete tableCompress table view

Special materials and lower set vacuum upon request.

Detail X Detail X Tank connection Inbreathing Outbreathing

Technical Data

Flange connection type

EN 1092-1; Form B1

ASME B16.5 CL 150 R.F.

EN 1092-1; Form B1

ASME B16.5 CL 150 R.F.

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other types upon request

Design Types and Specifications

The valve pallets are weight loaded. Higher set pressures are achieved by using spring loaded type DV/ZU-FTwo different designs are available:

In-line pressure and vacuum relief valve, standard design

DV/ZU - –

In-line pressure and vacuum relief valve with heating jacket

DV/ZU - H

In-line pressure and vacuum relief valve, standard design

DV/ZU - –

In-line pressure and vacuum relief valve with heating jacket

DV/ZU - H

Display complete tableCompress table view

Additional special devices available upon requestWithin piping systems the influence of backpressure has to be considered in deciding the set pressure and opening characteristics. For special design solutions (e.g. partial load operation) the valve can be supplied with standard valve pallets (with proportional opening function).

Settings

Pressure:

+2.0 mbar

+60 mbar

+0.8 inch W.C.

+24 inch W.C.

Vacuum:

-3.5 mbar

-50 mbar

-1.4 inch W.C.

-20 inch W.C.

For higher set pressure refer to type DV/ZU-F.Lower set vacuum upon request.

Detail X Detail X Tank connection Inbreathing Outbreathing

Flow capacity charts

Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.